You are way out of my zone :), but if you will check here you'll find a list of dependable rhododendrons for your area - Midwest Chapter

Here is a link that might be useful: Proven Performers

Thanks! Are any of these better in shady conditions (maybe an hour or two of direct sunlight) than others?

If you look at Greer Garden's online catalog there is a list of rhodoendron varieties for various purposes, including shade. The Proven Performers list referenced above is awfully sparse in the elepidote - evergreen large leaf types -category which is what most people envision when they think of rhododendrons. Additionally, small leaf elepidotes of which there are many more on the PP list, are not well adapted to a lot of shade. In general, most large leaf varieties will grow well in shade, but with reduced bloom. Two hours of direct sun and good light should mean very reasonable flower bud production for most varieties. A good local nursery should be able to help in selection as well.

I have a web page of shade tolerant rhododendrons at
http://rhodyman.net/rhodynsh.php#anchorSHADE

The best are a couple large leaved that are hardy:
Boule de Neige (white with great foliage).
Nova Zembla (red with good foliage).

The rest are either tender or small leaved.

Thanks! I've been paying closer attention to the sun/shade patterns and, as of now, it looks like this area gets 3-4 hours of afternoon/evening sun. This may change throughout the year, but it is more than I thought. Not sure if this changes what I can and can not plant???

You should be able to grow most hardy rhododendrons with that much sun. Nova Zembla and Boule de Neige would still be good choices if you like red and white.